Health Mate - Smart Calculator

What gets measured gets managed. Health Mate puts 16 professional-grade health calculators and 4 daily trackers in your pocket, each one built on published medical formulas and calibrated to Korean clinical standards from the Korean Society for the Study of Obesity and the Korea Disease Control and Prevention Agency. This is not a fitness fad app. It is a serious reference tool for anyone who wants to understand their body through numbers. THE CALCULATORS Body Composition - BMI Calculator -- Body Mass Index with Korean obesity classification thresholds, which differ from WHO standards and matter if you are Korean or living in Korea. - Basal Metabolic Rate (BMR) -- Mifflin-St Jeor equation for the calories your body burns at rest. - Total Daily Energy Expenditure (TDEE) -- BMR multiplied by your activity level, from sedentary to very active. - Body Fat Percentage -- US Navy circumference method with normative ranges by age and gender. - Ideal Weight Range -- Height and gender-based healthy weight window. - Total Body Water -- Watson formula estimate of the water your body holds. Nutrition and Hydration - Calorie Target -- Daily calorie intake for your goal: lose, maintain, or gain. - Water Intake Guide -- Recommended daily hydration calculated from your weight and activity level. Sleep - Sleep Cycle Calculator -- Enter your wake-up time and get optimal bedtime suggestions aligned to 90-minute sleep cycles, or vice versa. Pregnancy and Reproductive Health - Pregnancy Due Date -- Estimated delivery date from your last menstrual period. - Pregnancy Week -- Your current gestational week and trimester, with week-by-week development notes and tips. - Ovulation Window -- Predict fertile days based on your cycle length. Everyday - Pet Age Calculator -- Convert your pet's age into human years. Made for Korea - Health Insurance Grade -- Your national health insurance premium bracket and estimated monthly payment (2026 rates). - Military Fitness Standards -- Enlistment BMI thresholds and physical test grades. - Health Report Card -- A single graded score combining BMI, body fat, sleep, and exercise. THE TRACKERS Four built-in logs let you record daily data points without needing a separate app: - Weight -- Trend graph showing daily fluctuations and long-term direction. - Water Intake -- Visual progress bar toward your daily hydration goal. - Sleep -- Log bedtime, wake time, and sleep quality, then watch the trend. - Exercise -- Log workouts by type with auto-calculated calorie burn. ALSO INSIDE - Goals with reminders - Daily, weekly, and monthly trend charts - Streaks and achievements - Share result cards via KakaoTalk, LINE, Instagram, and more - Health app sync: read weight, height, body fat, water, and sleep from Apple Health (HealthKit) or Health Connect, and write your results back -- only if you allow it. WHY KOREAN STANDARDS MATTER BMI cutoffs for obesity are lower in Korea (25 vs. 30 internationally). Using the wrong standard can lead to false reassurance. Health Mate applies region-appropriate thresholds so your results are clinically meaningful. YOUR DATA Health data is stored on your device by default. If you sign in, your calculation history, tracker logs (weight, water, sleep, exercise), goals, and achievements are backed up to your account over encrypted HTTPS, so they survive a new phone or a reinstall. If you do not sign in, your health data never leaves the device. Body circumference measurements and your pregnancy due date stay on this device only and are never sent to a server. Health data is treated as sensitive personal information: it is collected with separate consent, and it is never used for personalized advertising or shared with third parties. You can wipe everything at any time from Settings, which also deletes the backup copy from your account. Health Mate is not a medical device. Results are for reference only -- please consult a healthcare professional for diagnosis.